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Index > Main > How to navigate by each byte of an array in FASM??

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jhonny6721



Joined: 07 Aug 2014
Posts: 26
jhonny6721
Hello, I'm trying to make a XOR encryption algorithm in ASM using FASM. I need make a loop that navigates in whole array. But, when i try to use:

Code:
mov bl, [lpBuffer+cx] ;Mov value of buffer + counter, to bl
    


It shows a error: reserved word uses as a symbol.

I need a way to navigate inside an array, by each element of it. Please, show me a short fragment about how to navigate in arrays using FASM.

Thanks for read my message.[/b]

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Post 09 Aug 2014, 16:31
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shutdownall



Joined: 02 Apr 2010
Posts: 518
Location: Munich
shutdownall
You have to get familiar with allowed addressing modes of x86.

mov bl, [lpBuffer+cx]

is not valid.

You could use

mov cl, [lpBuffer+bx]

or

mov bl, [lpBuffer+ecx]


You can find additional information here:
http://www.c-jump.com/CIS77/ASM/Addressing/lecture.html
Post 09 Aug 2014, 18:15
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jhonny6721



Joined: 07 Aug 2014
Posts: 26
jhonny6721
Thanks for your help, shutdownall. I am using your suggestions, and they work properly.

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Post 10 Aug 2014, 03:18
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